Sent: Thursday, March 29, 2007 10:09:43
From: Possma Net (possmanet@web.de)
I've finished the project yesterday - mounting an ETX-90RA OTA on
DS-2000 series mount. (i.e. making an DSX-90 out of an ETX-90RA OTA and
a cheaper version of DS-2130 named DSB-2130ATS (from Bresser, with a
poor 1m-reflector on the mount).)
This job was quite easy to do and really low cost. (1.30 Eur!) I am very
pleased with the construction so far - the first impressions last night
were really positive - now having a (cheaper than ETX-90EC)
ETX-autostar: It found every wanted object without problems and the
tracking was perfect for viewing. Plus there is a whole lot more space
for cameras attached to the ETX's back than in the original fork-mount.
The techincal part: I went to the next home improvement store and got a
sheet steel angle for just 1.30 Eur. It measures 10x10x10 cm. I drilled
4 holes for the DS-mount-arm on the one side, and another 2 holes for
the photoscrews on the bottom of the ETX OTA on the other one. There
already are 4 screws for the DS-arm present, they will fit. And for the
ETX OTA the two knurled screws that cap the two threads for the
mini-tripod-legs on the side of the ETX-base will perfectly fit into the
ETX-OTA's bottom side photo-threads. Finished!
I've attached some pictures of the adapter to the email to be published
on Your site.

For the future, i'm planning a wedge for my selfmade DSX-90 for longtime
astrophotography, and a "version-2.0-OTA-to-mount-adapter" by milling a
slot instead of holes, that allows to move the OTA along the line of
sight for balancing reasons.
Clear skies and greetings from germany,
Posma Net.